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Recently brought back from the dead a large battery from an old merc diesel. Been sat for 3 years with no use on it and not charged. £200 for a new one! so cleaned it out, baking soda solution the old acid, gentle hose piped it for an hour, then loaded with epsom salt solution (magnesium sulphate?) and charged back up, did a few high current runs during that charge.
Works alright! Starts and runs, checks out on a battery tester /load machine as "low capacity /replace soon" which is much better than utterly dead/won't take a charge like it was before.
BrickMan
lynx
No, this battery has gone completely flat repeatedly - I'm totally unsurprised that it's hosed, time for a new one.